They do have it on Carnival, Princess, NCL, Celebrity, HAL, and Costa. They have a channel that gives the ship's location, speed, and wind speed/direction. They also have interactive "maps" in various locations around the ship, that shows the location. I'm surprised that RCCL doesn't offer this. I haven't been on RCCL since the 90s, but I could have sworn they had it then. And, yes, it's way past time to sail them again